schwannoma

A benign, encapsulated neoplasm in which the fundamental component is structurally identical to a syncytium of Schwann cells; the neoplastic cells proliferate within the endoneurium, and the perineurium forms the capsule. The neoplasm may originate from a peripheral or sympathetic nerve, or from various cranial nerves, particularly the eighth nerve; when the nerve is small, it is usually found (if at all) in the capsule of the neoplasm; if the nerve is large, the neurilemoma may develop within the sheath of the nerve, the fibers of which may then spread over the surface of the capsule as the neoplasm enlarges. Microscopically, neurilemoma is composed of combinations of two patterns, Antoni types A and B, either of which may be predominant in various examples of neurilemomas. SEE ALSO: neurofibroma. SYN: neurilemoma, neuroschwannoma. [Theodor Schwann + -oma]
- acoustic s. SYN: vestibular s..
- vestibular s. a benign but life-threatening tumor arising from Schwann cells, usually of the vestibular division of the eighth cranial nerve; produces hearing loss, tinnitus, and vestibular disturbances, early and cerebellar, brainstem, and other cranial nerve signs and increased intracranial pressure in late stages. SYN: acoustic neurinoma, acoustic neuroma, acoustic s., acoustic tumor, cerebellopontine angle tumor, eighth nerve tumor.

* * *

schwan·no·ma shwä-'nō-mə n, pl -mas also -ma·ta -mət-ə NEURILEMMOMA

* * *

n.

* * *

schwan·no·ma (shwah-noґmə) 1. a neoplasm originating from Schwann cells (of the myelin sheath) of neurons; the two types are neurilemomas and neurofibromas. Called also schwannoglioma and Schwann cell tumor. 2. neurilemoma.

Medical dictionary. 2011.

Look at other dictionaries:

  • Schwannoma — Classification and external resources Schwannoma ICD 10 C …   Wikipedia

  • Schwannoma — periférico Antoni tipo A. El schwannoma, también conocido como neurilemmoma,[1] es un tumor de la vaina de mielina benigno compuesto por células de Schwann, las cuales normalmente producen la membrana aislante llamada vaina d …   Wikipedia Español

  • schwannoma — tumor de la sustancia blanca de Schwann Diccionario ilustrado de Términos Médicos.. Alvaro Galiano. 2010. schwannoma Tumor benigno, solitario, encapsulado, originado en el …   Diccionario médico

  • schwannoma — Eng. Schwannoma Ver neurilenoma …   Diccionario de oftalmología

  • schwannoma — n.; see neurofibroma, vestibular schwannoma …   The new mediacal dictionary

  • schwannoma — noun A benign nerve sheath tumour composed of Schwann cells …   Wiktionary

  • schwannoma — n. abnormal tissue growth originating in the Schwann cells of the myelin sheath (Medicine) …   English contemporary dictionary

  • schwannoma — schwan·no·ma …   English syllables

  • schwannoma — A tumor of the peripheral nervous system that arises in the nerve sheath (protective covering). It is almost always benign, but rare malignant schwannomas have been reported …   English dictionary of cancer terms

  • schwannoma — …   Useful english dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.